Get a temporary filename, similar to tempfile, except that it always writes to a temporary folder named beastier.
Examples
get_beastier_tempfilename()
#> [1] "/github/home/.cache/beastier/file71559f96ec5"
get_beastier_tempfilename(pattern = "my_pattern_")
#> [1] "/github/home/.cache/beastier/my_pattern_71540950a18"
get_beastier_tempfilename(fileext = ".ext")
#> [1] "/github/home/.cache/beastier/file7154f4a5fca.ext"